Open root on DCEN.

[Shield Arc]

This subject was brought up in another thread. Not wanting to high jack SSdoxie's thread, I started another one.
I mentioned in the other thread a lot of people run 6013 on DCEN, or straight polarity when welding sheet metal for less penetration. I also mentioned that when I do open root with 7018 I use DCEN. Mark @ Everlast and Arc weld two extremely knowledgeable weldors suggested I try open root with 6010 on DCEN. Don't know why I never thought of doing that! But I've never been good at thinking out of the box, I generally only do as I was taught, or learned myself is the best way to do things.

All I can say is WOW! I was really impressed with how this ran! I thought it was strange with the same joint prep I had to run 5 to 10-amps less than I normally do on DCEP. This is 6-inch sch 80 pipe 5-G, with 1/8-inch Lincoln 5P+ 6010.

I don't know why, but I thought I'd do a little side by side comparison with my Everlast PowerArc 200, and my Lincoln V350-Pro. Strange how a $300.00 import welder welds every bit as nice as a $5,000.00 welder made in Cleveland! Don't get me wrong the V350-Pro can do so much more than the PA-200, but when it comes to stick welding I can't tell any difference at all in the machines.
Here are the pictures, I just noticed the flash didn't work on some of the pictures of the welds the V350-Pro did. I need to get someone to teach me how to take pictures!

 

[BukitCase]

Your experience seems to back up the theory I've read - that straight polarity, because the deposition is going the same directions as electron flow, will deposit more metal at a given amperage - BUT, it also supposedly gives LESS penetration and heat transfer.

Have you tried a slice and dice of welds done both ways, and compared fusion/penetration? Just curious... Steve

 

[Shield Arc]

Only way I can think of that you might see anything beside x-ray is to etch with muriatic acid. I've never done that before. Not really sure you'd be able to see anything. Most of the root weld which was done on DCEN is on the inside of the pipe, I ran a hot pass over the root on DCEP, so if I did that right the top of the root should be consumed with the hot pass. I just don't know:confused3:, maybe one of the other guys has experience, or suggestions?

 

[Mark @ Everlast]

Did you notice any difference in the slag removal effort?

 

[Arc weld]

Never used straight polarity with 6010 but reverse might be easier to get full penetration and/or might have slightly better mechanical properties? I would say the 5P+ is probably a lot smoother on DC- than the old 5P. It's certainly nicer on DC+.

 

[Shield Arc]

Did you notice any difference in the slag removal effort?

No I didn't notice any difference there with the 5P+ from DCEN to DCEP, but what a dream to remove the slag of 5P+ over ESAB's 10P. Lower amps is the only real difference I seen. I did notice with both machines the arc just stopped a couple times, but that might have been me.

Never used straight polarity with 6010 but reverse might be easier to get full penetration

Actually I think I got a little more reenforcement on DCEN. Same joint prep I normally use. :confused3:

 

[SquirmyPug]

I've never heard of 6010 on straight polarity, might have to give it a try sometime. :drink:

 

[Shield Arc]

Hi Squirmy! Glad you made it over here.:thumbsup:

Hey guys, this is one sharp kid! He can make some beautiful welds, and very knowledgeable too.:cool2:

 

[SquirmyPug]

Hi Squirmy! Glad you made it over here.:thumbsup:

Hey guys, this is one sharp kid! He can make some beautiful welds, and very knowledgeable too.:cool2:

I would have signed up a while ago when you told me about this site but it was loading every page REALLY slowly. ullinghair:
Finally got the idea to try Google Chrome and it loads the pages fine now. Maybe I can help out a bit here now. :thumbsup:

 

[Mark @ Everlast]

From my neck of the woods (or corner of the country).